MS Teams - Dynamic E911 Quick Setup Guide

Make sure the location services for Teams is turned on.

In Windows navigate to Location Privacy Settings and make sure that Teams is listed as shown below.

Configure your Trusted IP's (Public IP/External IP):

• Browse to an External IP Lookup Site while on a computer at your configuring site. Below are some websites you can use to help.     

  • What Is My IP Address - See Your Public Address - IPv4 & IPv6

  • IP Chicken - What is my IP address? Free public IP lookup.

  • What's My IP Address? Networking Tools & More (whatsmyip.org)

• Make a note of the IP Address. Then Browse the Teams Admin Center

• Locations > Network Topology > Trusted Ips

  

Enter the IP Address you got from the External IP service; use 32 for the network range unless your network team can give you the actual range of the network in use.

VPN Considerations for Dynamic E911 Deployments

Important – VPN Considerations:
If users connect to Microsoft Teams through a VPN, especially a full‑tunnel VPN, subnet‑based location detection may not function as expected. VPN connections can mask internal IP addresses and cause Teams clients to appear outside of the corporate network, which can prevent accurate location detection for Dynamic E911.

In environments where VPN usage is common, Microsoft recommends prioritizing Wireless Access Points (WAPs) and Ethernet switches for location mapping instead of relying on internal subnets. Network elements such as WAPs and switches provide more reliable and precise location detection when users are connected through VPNs.

Microsoft also recommends configuring VPN split tunneling for Microsoft Teams traffic. Split tunneling allows Teams media and signaling traffic to bypass the VPN, improving call quality and ensuring proper network detection for services such as Dynamic Emergency Calling.

For additional guidance, see Microsoft’s documentation on preparing your network for Teams:
https://learn.microsoft.com/en-us/MicrosoftTeams/prepare-network

Configure your Network Site:

• Browse to the Teams Admin Center. Locations > Network Topology > Network Sites

• Click Add.

• In the "Add name for your network site" field, enter the name of your location.

• Then Click on Add subnets:

  

• Enter your local IP network and range here.

• You can use a Windows terminal to get this information.    

  • Right Click on your start menu, then select "Terminal."        

    • Type ipconfig

    • Look for the connected adapter.

    • Look for the IPv4 Address and Subnet Mask

  

• Browse to Calculator.net and put the values into the IPv4 Subnet Calculator    

  • IP Subnet Calculator

    • Select the Subnet and put the IP address in.

  

• Then, copy the network address from the results and use the CIDR Notation for the network range field.

• Apply and Save.

Note:

Subnet‑based location detection may be unreliable for VPN users. For VPN‑heavy environments, Microsoft recommends using Wireless Access Points and Ethernet switches for Dynamic E911 location mapping. [learn.microsoft.com]

Build Your Emergency Location:

(Skip this Step if you have already configured your emergency addresses)

• Build your location in the Teams Admin Center

• Locations > Emergency addresses

• Click Add.    

  • Find the location details, then click Save

  

Map your location to your subnet:

• From the Teams Admin Center, browse to Locations > Networks & Locations > Subnets

• Click On Add, then put in the Network Address from Step 3

  

• Search for your network location, then click Apply.

Important:

You will not be able to test this is working until you have been assigned a phone system license and phone number.

Restart and Test:

• Restart your Teams Client, then check if it detected the address correctly.

• On the upper right-hand corner, click the "…" menu, then Setting > Calls, and Look under the Emergency Location Header.

  

What's Next

You can repeat this process from any additional locations on your network. Please refer to the main guide for additional information, which this quick setup and test guide DID not cover. Once you have configured your central office locations you can enable Nomadic E911, or "External Look Up Mode", see this guide to quickly enable External Lookup Mode for your remote employee's. MS Teams - Nomadic E911 Quick Setup Guide (External Lookup Mode) - CallTower Solutions Center (uc.solutions)

MS Teams Dynamic e911 Dialing - Operator Connect and Direct Routing - CallTower Solutions Center (uc.solutions)

Test by dialing 933 and observing the address on the screen and played back in audio.